Urgent review of freight security

She said that lessons will be learned following the recent airline bomb plot: ‘the specifics of the attack - notably the type of device and how it was concealed - were new to us.’

As a result, all aspects of freight security will be urgently reviewed, and updated guidance will be issued to airport security personnel.

The threat has changed

The Home Secretary explained that the nature of the terrorist threat has changed in recent years. Although Al Qaeda is ‘weaker than at any time since 9/11,’ other groups now ‘aspire to attack us’.

Pointing to affiliate Al Qaeda groups in North Africa, Somalia and Yemen, she explained: ‘We see the continued emergence of a more diverse and devolved terrorist threat, without a strong, directive and commanding centre and joined more by ideology than hierarchy.’

Spending review

Theresa May confirmed that all funding for core counter-terrorist capabilities in policing and other agencies will be maintained. Over £2bn has been allocated for counter-terrorism policing alone in the next four years.

There will also be increased investment in police firearms capability in order to deal with the threat of a Mumbai-style attack in the UK.